Lock



Patented Sept. 13, 1938 UNITED STATES PATENT OFFICE Briggs & Stratton Corporation,

Milwaukee,

Wis., a corporation of Delaware Application October 16, 1937, Serial No. 169,394

10 Claims.

This invention relates to locks and refers particularly to cylinder locks of the type wherein the locking bolt is given a rotary motion.

In locks of this type, the locking bolt generally has a ninety degree travel between locked and unlocked positions, and as cylinder locks are now generally so constructed that the key can be inserted and withdrawn only when the cylinder is in one position of rotation, some form of lost motion connection must be provided between the cylinder and the bolt if it is desired,

to permit the key to be withdrawn and inserted in both the locked and unlocked positions.

While previous constructions did provide this lost motion connection between the cylinder and the locking bolt, they entailed the use of many parts which were difficult to assemble, and in general proved unsatisfactory.

It is therefore an object of this invention to improve the construction of locks of this character especially with respect to the manner in which the lost motion connection is established between the lock cylinder and the locking bolt. Another object of this invention is to provide 5 an improved construction'for the purpose described which reduces the number of parts re-- quired, and thus, effects a simpler and cheaper design.

With the above and other objects in view which will appear as the description proceeds, this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as some within the scope of the claims. The accompanying drawing illustrates one complete example of the physical embodiment of the invention constructed according to the best mode so far devised for the practical application of the principles thereof, and in which: Figure 1 is a side view of a lock constructed in accordance with this invention, having parts thereof broken away and in section;

Figure 2 is a cross sectional View through Figure 1 on the plane of the line 22;

Figure 3 is across sectional view taken on the same plane as Figure 2, but showing the locking bolt in its opposite position; and

Figure 4 is a perspective view of the inner end portion of the lock'casing.

Referring now particularly to the accompanying drawing in which like numerals indicate like parts, the numeral 5 designates the casing of the lock which is mounted in a support 6 and is bored as at l to rotatably receive a lock cylinder 8. The lock cylinder 8 is provided with the customary tumblers (not shown) to efiect a locking interengagement between the cylinder 5 and casing to secure the cylinder against rotation. Insertion of a proper key 9 into the keyway of the cylinder, the front end of which is exposed at the front of the support 6, retracts the tumblers and frees the cylinder for rota- 10 tion. The construction of these locking parts is such that the key can be inserted and withdrawn only when the cylinder is in one position of rotation.

The inner end of the casing has a counter- 15 bore ID to receive an enlarged inner end portion I! of the lock cylinder. The cylinder is inserted into the casing from itsinner end and is secured against longitudinal motion by an insert 12 driven into a transverse slot I3 in the 20 top of the casing at a short distance rearwardly of the bottom of the counterbore so that the insert I2 projects into an annular groove l4 encircling the enlarged inner end portion I I of the cylinder at this point. 25

At its extreme inner end, the cylinder has an enlarged head l5 and immediately forward of this head is an annular groove l6 interrupted at one point by a radial outwardly projecting lug IT. The groove I6 of the cylinder is in trans- 30 verse alignment with a round pilot bearing l8 concentric to the counterbore I0 and extending through slightly more than one hundred and eighty degrees of its circumference, the ends [9 and 20 of this round pilot bearing l8 providing 35 stops for a purpose to be hereinafter described.

Rotatably mounted on the bearing I8 is a locking bolt 2|. The bolt 2| is stamped from stiff sheet metal and has a round hole 22 centrally located with a lug 23 projecting radially in from 40' the periphery of the hole 22. The opposite ends of the bolt form locking ears and preferably have two diagonal corners 24 bent rearwardly to provide cam surfaces for engagement with keeper parts (not shown). 45

With the bolt properly positioned on the bearing I8, the lug 23 projects into the annular groove 16 in the cylinder to be engageable by the lug I! as the cylinder is turned, and inasmuch as the lug 23 enters the counterbore of 50 the casing through the cut-away portion of the bearing l8, it is also engageable with the stops formed by the ends l9 and 20 of the hearing.

The circumferential length of the lugs l1 and 23 and the distance between the stops I9 and 20 56 is such that when the cylinder makes one coming the counterbore between the edges of the pilot plete turn of three hundred and sixty degrees, the bolt is carried through ninety degrees of rotation, both limits of movement being accurately defined by the engagement of the lug 23 with either the stop l9 or 20, as clearly shown in Figures 2 and 3.

To hold the parts against rattling, a spring washer 25 provided with undulations circumferentially spaced is confined between the bolt and the enlarged head I5 of the cylinder.

In assembling the structure, the spring washer is first slipped over the front end of the cylinder and brought up against the head I5 on its inner end. Next, the locking bolt is eccentrically positioned over the front end of the cylinder and moved back into engagement with the spring washer, at which time its radial lug 23 is in line with the annular groove 16. With the bolt on the cylinder, the cylinder is then inserted into the bore of the casing, the pilot bearing I8 entering the round hole of the bolt. The parts are then secured against disassembly by driving the insert into the slot l3.

From the foregoing description taken in connection with the accompanying drawing, it will be readily apparent to those skilled in the art, that this invention improves the construction 01 locks of this character, and that it particularly reduces the number of parts required to provide the desired lost motion connection between the cylinder and the rotating bolt.

What I claim as my invention is:

1. In a lock: a bored casing; a cylinder rotatable therein; key controlled locking means carried. by the cylinder and engageable with the casing in one position of the cylinders rotation to secure the cylinder against rotation, said locking means and the casing being so constructed that the key can be inserted and withdrawn only when the cylinder is in said position of rotation; a locking bolt having a round hole to fit a casing part so that the bolt is rotatably mounted thereon; a radial abutment extended inwardly from the edge of the hole; and a radial abutment projecting outwardly from the cylinder in line with the other abutment so that rotation of the cylinder turns the bolt on its mounting, said abutments being of such circumferential length that a complete turn of the cylinder turns the bolt between locked and unlocked positions so that the key may be withdrawn in both positions.

2. In a look: a bored casing having a pilot bearing encircling the bore at its inner end with a segment of the bearing cut away; a locking bolt rotatable on said bearing and having an integral radial lug entering the bore through said cut-away segment; a lock cylinder rotatable in the bore; and an outwardly projecting radial lug on the cylinder engageable with opposite sides of the bolt carried lug to transmit rotary motion from the cylinder to the bolt.

3. In a lock of the character described: ,a casing having a bore counterbored at its inner end; a pilot bearing extending from the inner end of the casing and surrounding more than one hun- .dred and eighty degrees of the counterbore with the edges of the bearing spaced apart to afford access into the counterbore; a lock cylinder rotatable in the casing bore and having an annularly grooved portion disposed in said counterbore; a rotatable bolt mounted on said pilot bear ing; and cooperating radial lugs on the bolt and the cylinder to provide a lost motion driving connection therebetween, the bolt carried lug enterbearing and projecting into the groove of the cylinder, and the cylinder carried lug projecting from the bottom of its annular groove.

4. In a look: a bored casing; a pilot bearing carried by the casing and surrounding its bore; a lock cylinder rotatable in the bore and having an annular groove in line with the pilot bearing; a rotatable bolt mounted on said pilot bearing; an inwardly extending radial lug integral with the bolt and projecting into the bore to enter the annular groove of the cylinder through an opening in the wall of the bore, said opening being circumferentially wide enough to allow the bolt to turn through its required number of degrees; and a lug on the bottom of the groove of the cylinder engageable with the lug of the bolt to provide a lost motion driving connection between the cylinder and the bolt so that the cylinder turns a greater number of degrees than the bolt during the actuation of the bolt from one limit of movement to the other.

5. In a lock of the character described: a casing having a bore and having part of the Wall of said bore cut away at one end; a pilot bearing on said end of the casing encircling the bore and interrupted by said opening; a bolt journalled on said pilot bearing; a lug formed integrally with the bolt and projecting into the bore through said opening, said lug having a circumferential width so proportioned with respect to the width of the opening that engagement of the sides of the lug with the edges oi said opening properly defines the motion of the rotating bolt; a lock cylinder rotatable in the bore with a part in line with the locking bolt; and means carried by the cylinder and engageable with the lug of the bolt to transmit rotary movement from the cylinder to the bolt.

6. In a lock of the character described: a casing having a bore and having part of the wall of said bore cut away at one end; a pilot bear ing on said end of the casing encircling the bore and interrupted'by said opening; a bolt journalled on said pilot bearing; a lug formed integrally with the bolt and projecting into the bore through said opening, said lug having a circumferential width so proportioned with respect to the width of the opening that engagement of the sides of the lug with the edges of said opening properly defines the motion of the rotating bolt; a lock cylinder rotatable in the bore with a part in line with the locking bolt; and means carried by the cylinder and engageable with the lug of the bolt to transmit rotary movement from the cylinder to the bolt, said cylinder carried means being so proportioned with respect to the circumferential width of the lug on the bolt that a complete turn of the cylinder is required to move the bolt through the full range of its travel.

'7. In a lock: a bored casing having the wall of its bore cut through at one end thereof to provide a circumferential opening ofless than one hundred and eighty degrees; a pilot bearing encircling the bore at said end of the casing so that the edges of said opening define the'edges of the circular pilot bearing; a rotatable looking bolt having a hole to fit the bearing so as to be rotatably mounted thereon; an inwardly extending radial lug projectingfrom the periphcry of said hole through the opening and into the bore; a lock cylinder rotatable in the bore; and means carried by the cylinder and engageable withthe lug on the bolt to provide a lost motion connection between the cylinder and bolt, said means and the circumferential width of the lug on the bolt being such that a complete turn of the cylinder carries the locking bolt through substantially ninety degrees of rotation.

8. In a look: a bored casing having the wall of its bore cut through at one end thereof to provide a circumferential opening of less than one hundred and eighty degrees; a pilot bearing encircling the bore at said end of the casing so that the edges of said opening define the edges of the circular pilot bearing; a rotatable looking bolt having a hole to fit the bearing so as to be rotatably mounted thereon; an inwardly extending radial lug projecting from the periphery of said hole through the opening and into the bore; a lock cylinder rotatable in the bore; and means carried by the cylinder and engageable with the lug on the bolt to provide a 10st motion connection between the cylinder and bolt, said means and the circumferential Width of the lug on the bolt being such that a complete turn of the cylinder carries the locking bolt through substantially ninety degrees of rotation; and the edges of the circular pilot bearing being spaced apart a distance to limit the rotation of the bolt to substantially ninety degrees by contacting the opposite sides of its lug.

9. In a look: a bored casing having a cylindrical pilot bearing encircling the bore at its inner end, said bearing having a portion cut away to provide an opening communicating with the bore; a rotatable locking bolt having a circular hole to fit on the pilot bearing; a lug on said bolt extending through the cut away portion of the pilot bearing and projecting into said bore; a lock cylinder rotatable in the bore; means on the cylinder engageable with the lug on the bolt for providing a lost motion rotary connection with the bolt; retaining means for securing the cylinder in the casing bore; and an enlarged head on the cylinder adjacent to said pilot bearing for retaining the bolt in place on the bearing and preventing axial displacement thereof.

10. In a look: a bored casing having a portion at its inner extremity reduced in diameter to form a shoulder therewith, said portion having a segment cut away to provide communication with the bore; a locking bolt rotatable on said portion and adapted to engage said shoulder; a lug integral with the locking bolt radially entering the bore of the casing through said cut away segment; a lock cylinder rotatable in the bore; means on the cylinder engageable with the lug on the bolt for providing a lost motion rotary driving connection with the bolt; retaining means for securing the cylinder in the casing bore; and an enlarged head on the inner end of the cylinder adjacent to said portion for retaining the locking bolt on said reduced portion between the shoulder and head.

HUGO G. RUBNER. 

